But more than just research came from Rohan Krishnan's work. Out of it blossomed a friendship with Dr. Michael Hirsh, a surgeon and advocate who in 1981 lost a close friend and fellow surgeon, who was shot to death by a 15-year-old boy.

Police Commissioner John Barbieri praised the professionalism of the officers who acted coolly in the face of a potentially deadly situation, ultimately arrested the suspect and got a gun off the streets.

A man who was legally carrying his own handgun intervened as a suspect was trying to rob a 29-year-old woman at gunpoint, getting into a fight with the man while waiting for police to arrive, officials said.